They have some pre-school activity books that he might be able to do. My son never was into coloring, but as soon as he figured out his abc's and numbers he started doing connect the dot's and other activities like that. Now he's drawing people and things and even COLORING! There is always blocks - lego blocks. My son has some big legos and he loves building rockets, airplanes, cars, busses.... anything that goes, and then driving/flying it around the house.
When my baby was still little, I had my son do things around the house to help like bringing me things for baby (he'd pick out her outfit a bunch and get diapers and wipes...) and gathering laundry, emptying the dryer and bringing the clean clothes in the laundry basket into the living room. We also have a front loading washer, so he could help load the washer and start it and move the laundry between (and he LOVES the buttons and getting to push them...)
THat's also when we started getting him some short educational videos from the library for him to watch when I just couldn't keep my eyes open and wanted to get a short nap (he wasn't napping at the time). It kept him from doing horrible things to the walls and carpet.... If you trust him with scissors (ie, not cutting drapes, blankets, ect... ) and can supervise him a little, get him some scissors and some old magazines and let him hack away at those. If you're really brave, you can give him a glue stick and some construction paper and let him make cards for extended family members' birthdays and/or holidays... Of course, if you aren't nursing at the time he's doing it, you can help him. Otherwise, if he's like my son, you'll want him right next to you so you can make sure he doesn't damage walls, carpet, etc.... Also, practicing drawing his letters/numbers/shapes might be fun for him.
Good luck!